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R. TROWBRIDGE.

Shovel Plow.

Patented July 2, 1867.

lnventon @[aitzh tetra igatmtt @ffine RUFUS TROWB'RIDGE, OF WATERLOO,IOWA.

I Letters Patent No. 66,267, dated July 2, 1867.

SHOVBL-ILOUGH.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, RUFUS TROWBRIDGE, of Waterloo, in the county ofBlackliawk, in the State of Iowa, have invented a new and usefulImprovement on a Shovel-Plough; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the accompanyingdrawings. v

I construct my shovel-plough in any of the known forms, and attachthereto as many shovels as desired. I make my shovel for double-shovelploughs about eleven inches long, seven inches wide at the top, and sixand three-quarter inches wide at a point about two-thirds of thedistance from the top downward, at which latter point I make each edgeof a gentle and uniform curve until these curves meet at the lowerextremity forming the point of the shovel. This point I curve slightlyforward in the form of many shovels now in use. I make my shovel. of twoplates, the face of cast-steel three-eighths of an inch thick in themain. I weld-to this on the back side an iron plate one-quarter.of aninch thick, and make vboth to come to a sharp edge about one-third ofthe distance from the lower end upward. I then make'agroove in the facethree-eighths of an inch deep, and extending about two-thirds of thelength of the shovel from the top, and within about one-fourth of aninch on each side, leaving the steel on three sides of the grooveprojecting three-eighths of aninch above the iron plate. These steelprojections I groove under a little from the inside. I next make twoholes in the iron plate for bolting the shovel to the standard,andcountersink these holes in the common manner to receive the heads ofbolts on a plane surface with the plate, and fit these bolts in theirplaces. I then fit a plate of glass three-eighths of an inch thick intothe grooves spoken of, leaving it on a plane surface with the steelplate. I make my standard in the ordinary manner, except at the upperextremity of the shovel I make it to project out so as to be on a planesurface with the face of a shovel, which projection serves to keep theglass plate in its place. The glass and the form of the standard have agreat tendency to prevent the dirt from adhering to the shovel, and theglass prevent the wear to a great extent.

What I claim as my invention, and desire to secure by Letters Patent,isr The combination of a flat-glass plate to the face of the share ofshovel-ploughs, substantially as specified.

RUFUS TROWBRIDGE. Witnesses:

W. N. SMITH, H. B. ALLEN;

